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Table 5

Intrinsic column densities used in Fig. 4.

Name z NH(z)∕1022 cm−2
7C 1428+4218 4.715
     
QSO J0525–3343 4.413
     
QSO B1026–084 4.276
     
QSO B0014+810 3.366 <0.54
     
PKS 2126–158 3.268
     
QSO B0537–286 3.104
     
QSO B0438–43 2.852
     
RBS 315 2.69
     
QSO J2354–1513 2.675
     
PBC J1656.2–3303 2.4
     
QSO J0555+3948 2.363 <0.93
PKS 2149–306 2.345 <0.06
QSO B0237–2322 2.225 < 0.12
4C 71.07 2.172 <0.06
PKS 0528+134 2.07
     

TXS 2331+073 0.401 <0.04
4C +31.63 0.295 <0.003
B2 1128+31 0.29 <0.011
PKS 2004–447 0.24 <0.007
PMN J0623–6436 0.129 < 0.012
PKS 0521–365 0.055 <0.0004
OJ 287 0.306 < 0.003
BL Lacertae 0.069

Notes. For blazars in bold, NH (z) was obtained with the broadband 0.2−79 keV fit with additional Swift-XRT+NuSTAR data. Errors and upper limits were computed within XSPEC at 90% confidence level.

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